Ink cartridge



FIG. 1 is a front, side perspective view of an ink cartridge showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is an additional left-side view thereof, shown in an expanded position.

The broken lines are environmental only and form no part of the claimed design. 

The ornamental design for an ink cartridge, as shown and described. 